To what temperature should the hydrogen at 327°C be cooled at constant pressure, so that the root mean square velocity of its molecules become half of its previous value

To what temperature should the hydrogen at 327°C be cooled at constan

1.	To what temperature should the hydrogen at 327°C be cooled at constant pressure, so that the root mean square velocity of its molecules become half of its previous value
Answer» `-123^(@)C` `23^(@)C` `-100^(@)C` `0^(@)C` ANSWER :A